php arrays - arsdcollege.ac.inan array in php is actually an ordered map an array can be created...

PHP Arrays AGENDA

Index based Array

Associative Array

Accessing Array

Looping through Array

Some useful Functions

Array What is Array?

Indexing of Array

Integer based Index

Alphanumeric Index

Create a Indexed based Array <?php

$fruits = array("Apple",

"Mango", "Orange", "Kiwi");

print_r($fruits);

?>

Array (

[0] => Apple

[1] => Mango

[2] => Orange

[3] => Kiwi

)

Integer and Float Array

$array_int = array(1,2,3,4);

print_r($array_int);

$array_float = array(1.2, 2.2, 3.09,4.87);

print_r($array_float);

Array of String

<?php

$array_string = array("abc","xyz");

print_r($array_string);

?>

Mixed Array

<?php

$array_mixed = array("abc","xyz", 1,2 , 3.3);

print_r($array_mixed);

?>

Generalize a Array An array in PHP is actually an ordered map

An array can be created using the array() language construct

array( key => value, key2 => value2, key3 => value3, ... )

array(1, 2) is preferred over array(1, 2, )

last array element is optional and can be omitted

Fruits Array Output

Another way to create Indexed

based Array using Implicit location

<?php

$fruits[] = "Apple";

$fruits[] = "Mango";

$fruits[] = "Banana";

$fruits[] = "Watermelon";

print_r($fruits);

?>

Array (

[0] => Apple

[1] => Mango

[2] => Banana

[3] => Watermelon

)

Create Array using Explicit location

<?php

$fruits[0] = "Apple";

$fruits[1] = "Mango";

$fruits[2] = "Banana";

$fruits[3] = "Watermelon";

print_r($fruits);

?>

Accessing Array using For Loop <?Php

$fruits[0] = "Apple";

$fruits[1] = "Mango";

$fruits[2] = "Banana";

$fruits[3] = "Watermelon";

for ($j = 0 ; $j < 4 ; ++$j)

echo "$j: $fruits[$j] \n";

?>

0: Apple

1: Mango

2: Banana

3: Watermelon

Associative Arrays Keep Index based on Key

Easy to remember

More logical

And work better for large code and multiple persons team

Associative Arrays for Feedback <?php

$feedback['google'] = "Best Search Engine";

$feedback['yahoo'] = "Good for basic news";

$feedback['instagram'] = "Love for pics";

$feedback['facebook'] = "Stay connected with your friends";

echo $feedback['yahoo'];

?>

Output : Good for basic news

Assignment Using the array

Keyword (format index => value) <?php

$feedback = array(

'google' =>"Best Search Engine",

'yahoo' => "Good for basic news",

'instagram' => "Love for pics",

'facebook' => "Stay connected with your friends“

);

echo $feedback['yahoo'];

?>

foreach loop $j = 0;

foreach($feedback as $item)

{

echo "$j: $item \n";++$j;

}

0: Best Search Engine

1: Good for basic news

2: Love for pics

3: Stay connected with your friends

Accessing Key and Value <?php

$feedback = array('google' =>"Best Search Engine",

'yahoo' => "Good for basic news",

'instagram' => "Love for pics",

'facebook' => "Stay connected with your friends");

while (list($item, $description) = each($feedback))

echo "$item: $description \n";

?>

Output google: Best Search Engine

yahoo: Good for basic news

instagram: Love for pics

facebook: Stay connected with your friends

Multi-D Array <?php

$feedback =

array(1,2,array(3,4));

print_r($feedback);

?>

Array

(

[0] => 1

[1] => 2

[2] => Array

(

[0] => 3

[1] => 4

)

)

M-D Associative Array $feedback = array(

'user1' => array('google' =>"Best Search Engine",

'yahoo' => "Good for basic news",

'instagram' => "Love for pics",

'facebook' => "Stay connected with your friends"),

'user2' => array('google' =>"Search Engine",

'yahoo' => "I am not using",

'instagram' => "For young",

'facebook' => "For friends"),

'user3' => array('google' =>"I love it",

'yahoo' => "use only yahoo mail",

'instagram' => "I follow celebraity",

'facebook' => "I like it")

);

Accessing M-D Associative Array foreach($feedback as $user => $users)

foreach($users as $key => $value)

echo "$user:\t$key\t($value) \n";

Output user1: google (Best Search Engine)

user1: yahoo (Good for basic news)

user1: instagram (Love for pics)

user1: facebook (Stay connected with your friends)

user2: google (Search Engine)

user2: yahoo (I am not using)

user2: instagram (For young)

user2: facebook (For friends)

user3: google (I love it)

user3: yahoo (use only yahoo mail)

user3: instagram (I follow celebraity)

user3: facebook (I like it)

Array Functions is_array

Count

Sort

Shuffle

Explode

Extract

Compact

Reset

End

is_array()

To check variable is array or not

echo (is_array($fruits)) ? "Is an array" : "Is

not an array";

count($array)

Count all the top elements in a array

count($feedback) ; # 3

$p1 = array("Copier", "Inkjet", "Laser",

"Photo");

echo count($p1);#4

count(array,top_level) Top Level – 0 /1

0 : counting only top level array

1 : force recursive counting of sub arrays

count($feedback); # 3

count($feedback); # 15 (12+3)

$p1 = array("Copier", "Inkjet", "Laser", "Photo");

echo count($p1,1);#4

sort(array) Return true on success

Return false on error

<?php

$array = array(2,4,1,5,3);

echo "\n";

echo sort($array);

print_r($array);

$fruits = array("Mango",

"Apple", "Fig", "Grapes");

echo sort($fruits);

print_r($fruits);

?>

?>

1

Array

(

[0] => 1

[1] => 2

[2] => 3

[3] => 4

[4] => 5

)

1

Array

(

[0] => Apple

[1] => Fig

[2] => Grapes

[3] => Mango

)

Force sorting to be made either

numerically or as strings

sort($array, SORT_NUMERIC);

sort($array, SORT_STRING);

Reverse Order

rsort($fred, SORT_NUMERIC);

rsort($fred, SORT_STRING);

shuffle(array) Array

(

[0] => 7

[1] => 2

[2] => 6

[3] => 3

[4] => 4

[5] => 8

[6] => 1

[7] => 9

[8] => 5

)

Return true on success

Return false on error

<?php

$nos =

array(1,2,3,4,5,6,7,8,9);

shuffle($nos);

print_r($nos)

?>

explode() Convert string into array using some separator

Separator may be any char

<?php

$temp = explode(' ', "I am a coder");

print_r($temp);

?>

Array ( [0] => I [1] => am [2] => a [3] => coder )

explode() <?php

$temp = explode('#', "BCCD#ADDF#EEFG#AAAA");

print_r($temp);

?>

Array ( [0] => BCCD [1] => ADDF [2] => EEFG [3] => AAAA )

extract() Convert key/value pairs from an array into PHP

variables

Example : $_GET or $_POST variables as sent to

a PHP script by a form

extract($_GET);

compact() Inverse of extract()

<?php

$fname = "Krish";

$sname = "Richard";

$address = "A-3,NY, USA";

$contact = "854716632";

$contact = compact('fname', 'sname', 'address', 'contact');

print_r($contact);

?>

output Array

(

[fname] => Krish

[sname] => Richard

[address] => A-3,NY, USA

[contact] => 854716632

)

Thank You

Q& A